
/* Copyright (c) Mark J. Kilgard, 1994. */

/**
 * (c) Copyright 1993, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED
 * Permission to use, copy, modify, and distribute this software for
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * written prior permission.
 *
 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * US Government Users Restricted Rights
 * Use, duplication, or disclosure by the Government is subject to
 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
 * clause at DFARS 252.227-7013 and/or in similar or successor
 * clauses in the FAR or the DOD or NASA FAR Supplement.
 * Unpublished-- rights reserved under the copyright laws of the
 * United States.  Contractor/manufacturer is Silicon Graphics,
 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
 *
 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
 */
/*
 *  scene.c
 *  This program demonstrates the use of the GL lighting model.
 *  Objects are drawn using a grey material characteristic.
 *  A single light source illuminates the objects.
 */
#include <stdlib.h>
#include <GL/glut.h>

/*  Initialize material property and light source.
 */
void
myinit(void)
{
	GLfloat light_ambient[] =
	{0.0, 0.0, 0.0, 1.0};
	GLfloat light_diffuse[] =
	{1.0, 0.0, 0.0, 1.0};
	GLfloat light_specular[] =
	{1.0, 1.0, 1.0, 1.0};
	/* light_position is NOT default value */
	GLfloat light_position[] =
	{1.0, 1.0, 1.0, 0.0};

	glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
	glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
	glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
	glLightfv(GL_LIGHT0, GL_POSITION, light_position);

	glEnable(GL_LIGHT0);
	glDepthFunc(GL_LESS);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_LIGHTING);
}

void
display(void)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glPushMatrix();
	glScalef(1.3, 1.3, 1.3);
	glRotatef(20.0, 1.0, 0.0, 0.0);

	glPushMatrix();
	glTranslatef(-0.75, 0.5, 0.0);
	glRotatef(90.0, 1.0, 0.0, 0.0);
	glutSolidTorus(0.275, 0.85, 10, 15);
	glPopMatrix();

	glPushMatrix();
	glTranslatef(-0.75, -0.5, 0.0);
	glRotatef(270.0, 1.0, 0.0, 0.0);
	glutSolidTetrahedron();
	glPopMatrix();

	glPushMatrix();
	glTranslatef(0.75, 0.0, -1.0);
	glutSolidIcosahedron();
	glPopMatrix();

	glPopMatrix();
	glFlush();
}

void
myReshape(int w, int h)
{
	glViewport(0, 0, w, h);
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	if (w <= h)
		glOrtho(-2.5, 2.5, -2.5 * (GLfloat) h / (GLfloat) w,
		        2.5 * (GLfloat) h / (GLfloat) w, -10.0, 10.0);
	else
		glOrtho(-2.5 * (GLfloat) w / (GLfloat) h,
		        2.5 * (GLfloat) w / (GLfloat) h, -2.5, 2.5, -10.0, 10.0);
	glMatrixMode(GL_MODELVIEW);
}

void
polygon_mode(int value)
{
	switch (value) {
	case 1:
		glEnable(GL_DEPTH_TEST);
		glEnable(GL_LIGHTING);
		glDisable(GL_BLEND);
		glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
		break;
	case 2:
		glDisable(GL_DEPTH_TEST);
		glDisable(GL_LIGHTING);
		glColor3f(1.0, 1.0, 1.0);
		glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
		glEnable(GL_LINE_SMOOTH);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		break;
	}
	glutPostRedisplay();
}

void
main_menu(int value)
{
	if (value == 666)
		exit(0);
}

/*  Main Loop
 *  Open window with initial window size, title bar,
 *  RGBA display mode, and handle input events.
 */
int
main(int argc, char **argv)
{
	int submenu;

	glutInit(&argc, argv);
	glutInitWindowPosition(500, 500);
	glutInitWindowSize(500, 500);
	glutCreateWindow(argv[0]);
	myinit();
	glutReshapeFunc(myReshape);
	glutDisplayFunc(display);
	submenu = glutCreateMenu(polygon_mode);
	glutAddMenuEntry("Filled", 1);
	glutAddMenuEntry("Outline", 2);
	glutCreateMenu(main_menu);
	glutAddMenuEntry("Quit", 666);
	glutAddSubMenu("Polygon mode", submenu);
	glutAttachMenu(GLUT_RIGHT_BUTTON);
	glutMainLoop();
	return 0;             /* ANSI C requires main to return int. */
}
